Question

Important rock and roll artist and groups in the 1990s and early 21st century included which

Answer 1

Oasis (Apex)
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Answer 2

One of the most influential rock 'n' roll (alternative, metal, grange, gothic, punk...) artist and groups in these periods include:
- Nirvana
- Pantera 
- System of a Down
- Nightwish
- Slipknot
- Rammstein 
- Marilyn Manson
All of these bands, except for Nirvana, existed/exist in both given periods. They are one of the most influential rock 'n' roll bands from these periods, had and still have enormous followings. All of them were specific in their own way, and were the bands that expended the spectrum of the genres. They were inspiration for lot of young people, and were bands that very often were depicting the society and what's wrong with it in an artistic, sarcastic, interesting, progressive way.